1 /* 2 * Sysfs interface for the universal power supply monitor class 3 * 4 * Copyright © 2007 David Woodhouse <dwmw2@infradead.org> 5 * Copyright © 2007 Anton Vorontsov <cbou@mail.ru> 6 * Copyright © 2004 Szabolcs Gyurko 7 * Copyright © 2003 Ian Molton <spyro@f2s.com> 8 * 9 * Modified: 2004, Oct Szabolcs Gyurko 10 * 11 * You may use this code as per GPL version 2 12 */ 13 14 #include <linux/ctype.h> 15 #include <linux/device.h> 16 #include <linux/power_supply.h> 17 #include <linux/slab.h> 18 #include <linux/stat.h> 19 20 #include "power_supply.h" 21 22 /* 23 * This is because the name "current" breaks the device attr macro. 24 * The "current" word resolves to "(get_current())" so instead of 25 * "current" "(get_current())" appears in the sysfs. 26 * 27 * The source of this definition is the device.h which calls __ATTR 28 * macro in sysfs.h which calls the __stringify macro. 29 * 30 * Only modification that the name is not tried to be resolved 31 * (as a macro let's say). 32 */ 33 34 #define POWER_SUPPLY_ATTR(_name) \ 35 { \ 36 .attr = { .name = #_name }, \ 37 .show = power_supply_show_property, \ 38 .store = power_supply_store_property, \ 39 } 40 41 static struct device_attribute power_supply_attrs[]; 42 43 static const char * const power_supply_type_text[] = { 44 "Unknown", "Battery", "UPS", "Mains", "USB", 45 "USB_DCP", "USB_CDP", "USB_ACA", "USB_C", 46 "USB_PD", "USB_PD_DRP", "BrickID" 47 }; 48 49 static const char * const power_supply_usb_type_text[] = { 50 "Unknown", "SDP", "DCP", "CDP", "ACA", "C", 51 "PD", "PD_DRP", "PD_PPS", "BrickID" 52 }; 53 54 static const char * const power_supply_status_text[] = { 55 "Unknown", "Charging", "Discharging", "Not charging", "Full" 56 }; 57 58 static const char * const power_supply_charge_type_text[] = { 59 "Unknown", "N/A", "Trickle", "Fast", "Standard", "Adaptive", "Custom" 60 }; 61 62 static const char * const power_supply_health_text[] = { 63 "Unknown", "Good", "Overheat", "Dead", "Over voltage", 64 "Unspecified failure", "Cold", "Watchdog timer expire", 65 "Safety timer expire", "Over current" 66 }; 67 68 static const char * const power_supply_technology_text[] = { 69 "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd", 70 "LiMn" 71 }; 72 73 static const char * const power_supply_capacity_level_text[] = { 74 "Unknown", "Critical", "Low", "Normal", "High", "Full" 75 }; 76 77 static const char * const power_supply_scope_text[] = { 78 "Unknown", "System", "Device" 79 }; 80 81 static ssize_t power_supply_show_usb_type(struct device *dev, 82 enum power_supply_usb_type *usb_types, 83 ssize_t num_usb_types, 84 union power_supply_propval *value, 85 char *buf) 86 { 87 enum power_supply_usb_type usb_type; 88 ssize_t count = 0; 89 bool match = false; 90 int i; 91 92 for (i = 0; i < num_usb_types; ++i) { 93 usb_type = usb_types[i]; 94 95 if (value->intval == usb_type) { 96 count += sprintf(buf + count, "[%s] ", 97 power_supply_usb_type_text[usb_type]); 98 match = true; 99 } else { 100 count += sprintf(buf + count, "%s ", 101 power_supply_usb_type_text[usb_type]); 102 } 103 } 104 105 if (!match) { 106 dev_warn(dev, "driver reporting unsupported connected type\n"); 107 return -EINVAL; 108 } 109 110 if (count) 111 buf[count - 1] = '\n'; 112 113 return count; 114 } 115 116 static ssize_t power_supply_show_property(struct device *dev, 117 struct device_attribute *attr, 118 char *buf) { 119 ssize_t ret; 120 struct power_supply *psy = dev_get_drvdata(dev); 121 enum power_supply_property psp = attr - power_supply_attrs; 122 union power_supply_propval value; 123 124 if (psp == POWER_SUPPLY_PROP_TYPE) { 125 value.intval = psy->desc->type; 126 } else { 127 ret = power_supply_get_property(psy, psp, &value); 128 129 if (ret < 0) { 130 if (ret == -ENODATA) 131 dev_dbg(dev, "driver has no data for `%s' property\n", 132 attr->attr.name); 133 else if (ret != -ENODEV && ret != -EAGAIN) 134 dev_err_ratelimited(dev, 135 "driver failed to report `%s' property: %zd\n", 136 attr->attr.name, ret); 137 return ret; 138 } 139 } 140 141 switch (psp) { 142 case POWER_SUPPLY_PROP_STATUS: 143 ret = sprintf(buf, "%s\n", 144 power_supply_status_text[value.intval]); 145 break; 146 case POWER_SUPPLY_PROP_CHARGE_TYPE: 147 ret = sprintf(buf, "%s\n", 148 power_supply_charge_type_text[value.intval]); 149 break; 150 case POWER_SUPPLY_PROP_HEALTH: 151 ret = sprintf(buf, "%s\n", 152 power_supply_health_text[value.intval]); 153 break; 154 case POWER_SUPPLY_PROP_TECHNOLOGY: 155 ret = sprintf(buf, "%s\n", 156 power_supply_technology_text[value.intval]); 157 break; 158 case POWER_SUPPLY_PROP_CAPACITY_LEVEL: 159 ret = sprintf(buf, "%s\n", 160 power_supply_capacity_level_text[value.intval]); 161 break; 162 case POWER_SUPPLY_PROP_TYPE: 163 ret = sprintf(buf, "%s\n", 164 power_supply_type_text[value.intval]); 165 break; 166 case POWER_SUPPLY_PROP_USB_TYPE: 167 ret = power_supply_show_usb_type(dev, psy->desc->usb_types, 168 psy->desc->num_usb_types, 169 &value, buf); 170 break; 171 case POWER_SUPPLY_PROP_SCOPE: 172 ret = sprintf(buf, "%s\n", 173 power_supply_scope_text[value.intval]); 174 break; 175 case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER: 176 ret = sprintf(buf, "%s\n", value.strval); 177 break; 178 default: 179 ret = sprintf(buf, "%d\n", value.intval); 180 } 181 182 return ret; 183 } 184 185 static ssize_t power_supply_store_property(struct device *dev, 186 struct device_attribute *attr, 187 const char *buf, size_t count) { 188 ssize_t ret; 189 struct power_supply *psy = dev_get_drvdata(dev); 190 enum power_supply_property psp = attr - power_supply_attrs; 191 union power_supply_propval value; 192 193 switch (psp) { 194 case POWER_SUPPLY_PROP_STATUS: 195 ret = sysfs_match_string(power_supply_status_text, buf); 196 break; 197 case POWER_SUPPLY_PROP_CHARGE_TYPE: 198 ret = sysfs_match_string(power_supply_charge_type_text, buf); 199 break; 200 case POWER_SUPPLY_PROP_HEALTH: 201 ret = sysfs_match_string(power_supply_health_text, buf); 202 break; 203 case POWER_SUPPLY_PROP_TECHNOLOGY: 204 ret = sysfs_match_string(power_supply_technology_text, buf); 205 break; 206 case POWER_SUPPLY_PROP_CAPACITY_LEVEL: 207 ret = sysfs_match_string(power_supply_capacity_level_text, buf); 208 break; 209 case POWER_SUPPLY_PROP_SCOPE: 210 ret = sysfs_match_string(power_supply_scope_text, buf); 211 break; 212 default: 213 ret = -EINVAL; 214 } 215 216 /* 217 * If no match was found, then check to see if it is an integer. 218 * Integer values are valid for enums in addition to the text value. 219 */ 220 if (ret < 0) { 221 long long_val; 222 223 ret = kstrtol(buf, 10, &long_val); 224 if (ret < 0) 225 return ret; 226 227 ret = long_val; 228 } 229 230 value.intval = ret; 231 232 ret = power_supply_set_property(psy, psp, &value); 233 if (ret < 0) 234 return ret; 235 236 return count; 237 } 238 239 /* Must be in the same order as POWER_SUPPLY_PROP_* */ 240 static struct device_attribute power_supply_attrs[] = { 241 /* Properties of type `int' */ 242 POWER_SUPPLY_ATTR(status), 243 POWER_SUPPLY_ATTR(charge_type), 244 POWER_SUPPLY_ATTR(health), 245 POWER_SUPPLY_ATTR(present), 246 POWER_SUPPLY_ATTR(online), 247 POWER_SUPPLY_ATTR(authentic), 248 POWER_SUPPLY_ATTR(technology), 249 POWER_SUPPLY_ATTR(cycle_count), 250 POWER_SUPPLY_ATTR(voltage_max), 251 POWER_SUPPLY_ATTR(voltage_min), 252 POWER_SUPPLY_ATTR(voltage_max_design), 253 POWER_SUPPLY_ATTR(voltage_min_design), 254 POWER_SUPPLY_ATTR(voltage_now), 255 POWER_SUPPLY_ATTR(voltage_avg), 256 POWER_SUPPLY_ATTR(voltage_ocv), 257 POWER_SUPPLY_ATTR(voltage_boot), 258 POWER_SUPPLY_ATTR(current_max), 259 POWER_SUPPLY_ATTR(current_now), 260 POWER_SUPPLY_ATTR(current_avg), 261 POWER_SUPPLY_ATTR(current_boot), 262 POWER_SUPPLY_ATTR(power_now), 263 POWER_SUPPLY_ATTR(power_avg), 264 POWER_SUPPLY_ATTR(charge_full_design), 265 POWER_SUPPLY_ATTR(charge_empty_design), 266 POWER_SUPPLY_ATTR(charge_full), 267 POWER_SUPPLY_ATTR(charge_empty), 268 POWER_SUPPLY_ATTR(charge_now), 269 POWER_SUPPLY_ATTR(charge_avg), 270 POWER_SUPPLY_ATTR(charge_counter), 271 POWER_SUPPLY_ATTR(constant_charge_current), 272 POWER_SUPPLY_ATTR(constant_charge_current_max), 273 POWER_SUPPLY_ATTR(constant_charge_voltage), 274 POWER_SUPPLY_ATTR(constant_charge_voltage_max), 275 POWER_SUPPLY_ATTR(charge_control_limit), 276 POWER_SUPPLY_ATTR(charge_control_limit_max), 277 POWER_SUPPLY_ATTR(charge_control_start_threshold), 278 POWER_SUPPLY_ATTR(charge_control_end_threshold), 279 POWER_SUPPLY_ATTR(input_current_limit), 280 POWER_SUPPLY_ATTR(energy_full_design), 281 POWER_SUPPLY_ATTR(energy_empty_design), 282 POWER_SUPPLY_ATTR(energy_full), 283 POWER_SUPPLY_ATTR(energy_empty), 284 POWER_SUPPLY_ATTR(energy_now), 285 POWER_SUPPLY_ATTR(energy_avg), 286 POWER_SUPPLY_ATTR(capacity), 287 POWER_SUPPLY_ATTR(capacity_alert_min), 288 POWER_SUPPLY_ATTR(capacity_alert_max), 289 POWER_SUPPLY_ATTR(capacity_level), 290 POWER_SUPPLY_ATTR(temp), 291 POWER_SUPPLY_ATTR(temp_max), 292 POWER_SUPPLY_ATTR(temp_min), 293 POWER_SUPPLY_ATTR(temp_alert_min), 294 POWER_SUPPLY_ATTR(temp_alert_max), 295 POWER_SUPPLY_ATTR(temp_ambient), 296 POWER_SUPPLY_ATTR(temp_ambient_alert_min), 297 POWER_SUPPLY_ATTR(temp_ambient_alert_max), 298 POWER_SUPPLY_ATTR(time_to_empty_now), 299 POWER_SUPPLY_ATTR(time_to_empty_avg), 300 POWER_SUPPLY_ATTR(time_to_full_now), 301 POWER_SUPPLY_ATTR(time_to_full_avg), 302 POWER_SUPPLY_ATTR(type), 303 POWER_SUPPLY_ATTR(usb_type), 304 POWER_SUPPLY_ATTR(scope), 305 POWER_SUPPLY_ATTR(precharge_current), 306 POWER_SUPPLY_ATTR(charge_term_current), 307 POWER_SUPPLY_ATTR(calibrate), 308 /* Properties of type `const char *' */ 309 POWER_SUPPLY_ATTR(model_name), 310 POWER_SUPPLY_ATTR(manufacturer), 311 POWER_SUPPLY_ATTR(serial_number), 312 }; 313 314 static struct attribute * 315 __power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1]; 316 317 static umode_t power_supply_attr_is_visible(struct kobject *kobj, 318 struct attribute *attr, 319 int attrno) 320 { 321 struct device *dev = container_of(kobj, struct device, kobj); 322 struct power_supply *psy = dev_get_drvdata(dev); 323 umode_t mode = S_IRUSR | S_IRGRP | S_IROTH; 324 int i; 325 326 if (attrno == POWER_SUPPLY_PROP_TYPE) 327 return mode; 328 329 for (i = 0; i < psy->desc->num_properties; i++) { 330 int property = psy->desc->properties[i]; 331 332 if (property == attrno) { 333 if (psy->desc->property_is_writeable && 334 psy->desc->property_is_writeable(psy, property) > 0) 335 mode |= S_IWUSR; 336 337 return mode; 338 } 339 } 340 341 return 0; 342 } 343 344 static struct attribute_group power_supply_attr_group = { 345 .attrs = __power_supply_attrs, 346 .is_visible = power_supply_attr_is_visible, 347 }; 348 349 static const struct attribute_group *power_supply_attr_groups[] = { 350 &power_supply_attr_group, 351 NULL, 352 }; 353 354 void power_supply_init_attrs(struct device_type *dev_type) 355 { 356 int i; 357 358 dev_type->groups = power_supply_attr_groups; 359 360 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) 361 __power_supply_attrs[i] = &power_supply_attrs[i].attr; 362 } 363 364 static char *kstruprdup(const char *str, gfp_t gfp) 365 { 366 char *ret, *ustr; 367 368 ustr = ret = kmalloc(strlen(str) + 1, gfp); 369 370 if (!ret) 371 return NULL; 372 373 while (*str) 374 *ustr++ = toupper(*str++); 375 376 *ustr = 0; 377 378 return ret; 379 } 380 381 int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env) 382 { 383 struct power_supply *psy = dev_get_drvdata(dev); 384 int ret = 0, j; 385 char *prop_buf; 386 char *attrname; 387 388 if (!psy || !psy->desc) { 389 dev_dbg(dev, "No power supply yet\n"); 390 return ret; 391 } 392 393 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name); 394 if (ret) 395 return ret; 396 397 prop_buf = (char *)get_zeroed_page(GFP_KERNEL); 398 if (!prop_buf) 399 return -ENOMEM; 400 401 for (j = 0; j < psy->desc->num_properties; j++) { 402 struct device_attribute *attr; 403 char *line; 404 405 attr = &power_supply_attrs[psy->desc->properties[j]]; 406 407 ret = power_supply_show_property(dev, attr, prop_buf); 408 if (ret == -ENODEV || ret == -ENODATA) { 409 /* When a battery is absent, we expect -ENODEV. Don't abort; 410 send the uevent with at least the the PRESENT=0 property */ 411 ret = 0; 412 continue; 413 } 414 415 if (ret < 0) 416 goto out; 417 418 line = strchr(prop_buf, '\n'); 419 if (line) 420 *line = 0; 421 422 attrname = kstruprdup(attr->attr.name, GFP_KERNEL); 423 if (!attrname) { 424 ret = -ENOMEM; 425 goto out; 426 } 427 428 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf); 429 kfree(attrname); 430 if (ret) 431 goto out; 432 } 433 434 out: 435 free_page((unsigned long)prop_buf); 436 437 return ret; 438 } 439